Port A Benchmark

Port an existing third-party benchmark or eval into this repo as an Inspect AI task, faithfully. Use this whenever the task is "add benchmark X", "port this eval", "can we run <github repo> here", or adapting any external eval harness (aiewf-eval, lm-evaluation-harness, a paper's repo, a colleague's script). Enforces the one rule that makes a port worth anything — copy the measuring instrument verbatim, adapt only the runner — plus the verification steps that prove the port is faithful rather th